When you write $this->Model->find('list'), it gives you an array in return.
If you want only 1 field value , then you should use
$this->Model->field('filename',array('conition goes here'));

In your case it should be $var =
$this->Login->field('Category',('Login.username'=>$dbuser['Login']['username']));

make sure to check the case of the field name i.e its Category or category
in you database.

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